A/C compressor is short cycling
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A/C compressor is short cycling
I just finished an a/c job on a 2010 ss. Replaced the expansion valve, condenser, compressor, and I flushed the lines. I vacuumed for 30 minutes and then charged it with 1.32lbs of 134a, like the badge in the engine bay says. When I start the car, my high side pressure begins to climb to 400-430. Compressor will kick on for a few seconds, then turn off for about 15 seconds, and then will repeat. Everywhere I read either says i have a restriction somewhere in the system, or I'm low on Freon. Checked my relays and fuses and they are all good. Replaced my service ports and all my seals. I don't have any leak. I don't understand how I could have any type of restriction after replacing almost the whole a/c system.
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From: Franklin, KY near Beech Bend Raceway, Corvette Plant and Museum.
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Re: A/C compressor is short cycling
What generation Camaro is a 2010 SS?
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Re: A/C compressor is short cycling
This forum is EXCLUSIVELY for 82-92 Camaro & Firebird. It is NOT a general open tech Q&A kind of thing.
That said, any AC system that does what you describe, regardless of what refrigerant it uses or what sheet metal is wrapped around it or what age it is, has a blockage. Most likely trash in the orifice tube (if that system has one of those... not being a 82-92 Camaro or Firebird, I don't know) or TXV if it has one of those, that particular part being the smallest passage in the system to begin with and thus the easiest to block. Since you really haven't replaced much of anything (not the compressor, lines, condenser, evaporator, dryer, etc.) - CERTAINLY NOT "the entire system" no matter what you think about it - whatever little you have done hasn't addressed the actual problem, but instead was just sort of nibbling uselessly around the edges without actually accomplishing anything.
If it was low on refrigerant the pressures would low on both sides. Kind of hard to overpressurize a partial vacuum. That's not the problem.
That said, any AC system that does what you describe, regardless of what refrigerant it uses or what sheet metal is wrapped around it or what age it is, has a blockage. Most likely trash in the orifice tube (if that system has one of those... not being a 82-92 Camaro or Firebird, I don't know) or TXV if it has one of those, that particular part being the smallest passage in the system to begin with and thus the easiest to block. Since you really haven't replaced much of anything (not the compressor, lines, condenser, evaporator, dryer, etc.) - CERTAINLY NOT "the entire system" no matter what you think about it - whatever little you have done hasn't addressed the actual problem, but instead was just sort of nibbling uselessly around the edges without actually accomplishing anything.
If it was low on refrigerant the pressures would low on both sides. Kind of hard to overpressurize a partial vacuum. That's not the problem.
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Re: A/C compressor is short cycling
Your restriction is going to be between the compressor and the txv (high side). On those, when the compressor fails internally, we replace full system including the discharge line assembly because it has a muffler section. No amount of flushing will clear it.
you can use an infrared thermometer and chase the heat to see where your restriction actually lies
you can use an infrared thermometer and chase the heat to see where your restriction actually lies
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